Method for preparing modified activated carbon from phenol through fast ultralow-temperature freezing

A technology of ultra-low temperature freezing and activated carbon, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of complex process, high direct cost or indirect cost, etc., and achieve the effect of simple operation and low cost

Active Publication Date: 2017-05-31
ENERGY RES INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activated carbons prepared by the aforementioned methods all have a certain adsorption effect on formaldehyde, but some of the processes are complex, and some require adjustments to the original process, resulting in high direct or indirect costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Crush the dried fruit shell to 0.15mm~30.00mm, weigh it for later use. Configure phosphoric acid solution with a mass fraction of 25%. The weighed fruit shell was mixed with the phosphoric acid solution according to the impregnation ratio of 1:2, and left to stand for 2 hours to obtain the mixture A. Weigh phenol equivalent to 1 / 10 of the weight of mixture A and mix it with mixture A, put it in a 105°C drying oven, and dry it for 12 hours to obtain mixture B. Put the mixture B into the ceramic reactor, first pass nitrogen, and after purging the oxygen, start the heating switch of the ceramic reactor. The ceramic reactor was heated up to 600° C. at a heating rate of 10° C. / min and kept for 2 hours to obtain activated material C. When the activation time stops, quickly sink the activation material C into a container filled with liquid nitrogen, and quickly seal the container, place it on a shaker, and shake it for 2 hours to obtain the activation material D. Put the ac...

Embodiment 2

[0015] Embodiment 2 (comparative example)

[0016] Crush the dried fruit shell to 0.15mm~30.00mm, weigh it for later use. Configure phosphoric acid solution with a mass fraction of 25%. The weighed fruit shell was mixed with the phosphoric acid solution according to the impregnation ratio of 1:2, and left to stand for 2 hours to obtain the mixture A. Weigh phenol equivalent to the weight of 1 / 10 of the mixture A and mix it with the mixture A, put it into a drying oven at 105° C., and dry it for 12 hours to obtain the mixture B. Put the mixture B into the ceramic reactor, first pass nitrogen, and after purging the oxygen, start the heating switch of the ceramic reactor. The ceramic reactor was heated up to 600° C. at a heating rate of 10° C. / min and kept for 2 hours to obtain activated material C. When the activation time stops, quickly sink the activation material C into a container filled with -20°C ice-salt water, quickly seal the container, place it on a shaker, and shak...

Embodiment 3

[0018] Embodiment 3 (comparative example)

[0019] Crush the dried fruit shell to 0.15mm~30.00mm, weigh it for later use. Configure phosphoric acid solution with a mass fraction of 25%. The weighed fruit shell was mixed with the phosphoric acid solution according to the impregnation ratio of 1:2, and left to stand for 2 hours to obtain the mixture A. Weigh phenol equivalent to the weight of 1 / 10 of the mixture A and mix it with the mixture A, put it into a drying oven at 105° C., and dry it for 12 hours to obtain the mixture B. Put the mixture B into the ceramic reactor, first pass nitrogen, and after purging the oxygen, start the heating switch of the ceramic reactor. The ceramic reactor was heated up to 600° C. at a heating rate of 10° C. / min and kept for 2 hours to obtain activated material C. When the activation time stops, turn off the ceramic heating switch, cool down naturally until it reaches room temperature, and then turn off the nitrogen gas to obtain the activat...

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Abstract

The invention discloses a method for preparing modified activated carbon from phenol through fast ultralow-temperature freezing. The method comprises the steps of weighing crushed nutshell as a raw material, dipping in a phosphoric acid solution, mixing with phenol and drying; carrying out activation in an oxygen-free environment at a high temperature of 300-1100 DEG C for 0.5-24h; after activation is completed, quickly soaking the activated material into liquid nitrogen or brine ice below -20 DEG C at the high temperature, carrying out sealed oscillation for 2h and then taking out the activated material; oscillating and cleaning the activated material by using deionized water until neutral and drying to obtain the modified activated carbon. According to the method for preparing the activated carbon, the specific surface area of the obtained activated carbon is obviously increased in comparison with that of a phenolic hydroxyl group of the activated carbon obtained through same-concentration phosphoric acid activation and natural cooling, and the energy-saving effect is obvious.

Description

technical field [0001] The invention belongs to the technical field of preparation of activated carbon, and in particular relates to a method for preparing modified activated carbon by using phenol and rapid ultra-low temperature freezing. Background technique [0002] Activated carbon is one of the commonly used adsorbents, and has been widely used in food hygiene, medical treatment, catalysis, air separation nitrogen production, and coke environmental protection. The strong adsorption performance of activated carbon mainly depends on its huge specific surface area, and the research results of Mei Fanmin [2010] and Liu Guocheng [2014] show that for specific components, such as formaldehyde, carbon dioxide, chromium ions, lead ions, mercury ions, etc. The selective adsorption of activated carbon depends on the pore structure and surface functional groups of activated carbon. Mei Fanmin [2010] studied the effect of acidic oxygen-containing functional groups on the surface of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/342C01B32/366
CPCC01P2006/12C01P2006/21C01P2006/90
Inventor 司洪宇张晓东李勇刚梁晓辉梅宁赵健杨黎军华栋梁赵玉晓钟统贤秦超
Owner ENERGY RES INST OF SHANDONG ACAD OF SCI
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